I am using a WordPress plugin called feedwordpress in order to run a planet like website on wordpress (See it here).

The plugin is great except for one thing - it hogs down my (VPS) server into submission once every week or so.

In a recent e-mail exchange with the webadmin he wrote the following:

It does look like the increased mysql
resource usage is being caused by slow
queries being run by r-bloggers.com.
Here is a copy of some of the logs
that are being produced. You would
need to optimize this site and
database further to have it running as
efficiently as possible. If these
changes have already been made, your
best option would be to look into a
large upgrade for your VPS due to the
high level or resources and traffic
that your site needs and sees.